Flexible Display Device

1. A display device comprising: a display panel including a folding area and a nonfolding area located around the folding area; a panel bottom member under the display panel and overlapping with the folding area and the nonfolding area; and a first pattern formed in the panel bottom member and overlapping with the folding area, wherein the panel bottom member comprises a buffer member and a support member between the display panel and the buffer member, and the first pattern is recessed from a lower surface of the support member.

2. The display device of claim 1 , wherein the first pattern has a groove shape recessed from the lower surface of the support member.

3. The display device of claim 2 , wherein the first pattern has a line shape extending continuously along the folding area.

4. The display device of claim 1 , wherein the first pattern has an uneven shape on the lower surface of the support member.

5. The display device of claim 4 , wherein the first pattern includes a relatively protruded convex portion, and the convex portion is not protruded from the lower surface of the support member.

6. The display device of claim 1 , wherein the support member includes a metal.

7. The display device of claim 6 , wherein an end of the first pattern is aligned with a boundary between the folding area and the nonfolding area.

8. The display device of claim 6 , wherein an end of the first pattern is in the nonfolding area.

9. The display device of claim 1 , further comprising a second pattern formed in the buffer member and overlapping with the first pattern.

10. The display device of claim 1 , wherein an upper surface of the buffer member faces the lower surface of the support member, and wherein the upper surface of the buffer member overlaps the first pattern.

11. A display device comprising: a display panel including a folding area and a nonfolding area located around the folding area; and a panel bottom member under the display panel and comprising a rigid material overlapping with the folding area, the panel bottom member having a first thickness in the folding area and a second thickness in the nonfolding area, the first thickness being thinner than the second thickness.

12. The display device of claim 11 , wherein the panel bottom member includes a buffer member, and a first pattern is formed on an upper surface or a lower surface of the buffer member.

13. The display device of claim 12 , wherein the first pattern has a groove shape recessed from the upper surface or the lower surface of the buffer member.

14. The display device of claim 12 , wherein the first pattern has an uneven shape on the upper surface or the lower surface of the buffer member.

15. The display device of claim 11 , wherein an interval between an upper surface of the panel bottom member and the display panel is constant.

16. The display device of claim 15 , wherein the rigid material includes a metal.

17. The display device of claim 15 , further comprising a buffer member at a lower portion of the panel bottom member.

18. The display device of claim 17 , wherein the buffer member has a third thickness in the folding area and a fourth thickness in the nonfolding area, and the third thickness is thinner than the fourth thickness.

19. The display device of claim 18 , wherein the first thickness is thinner than the third thickness.